1,5-diazabicyclo[5.4.0]undeca-5-ene in dimethyl sulfoxide T=100°C; 24 h;

1: 55 percent / phosphorus pentachloride / xylene / 2 h / 80 °C 2: 36 percent / 1,5-diazabicyclo<5.4.0>undec-5-ene / dimethylsulfoxide / 24 h / 100 °C View Scheme